单项选择题

[听力原文] 9-10
 Mary: Reception, Good morning.
 Smith: Good morning. This is Mr. Smith at room 506. My company has been in touch with me this morning. They’d like me to stay on here in Naples for two more days. I wonder if it is possible to extend my stay here until 29th
 Mary: Would you hold the line, Mr. Smith I’ll check the booking situation...yes ,that will be all right. It may be necessary to ask you to change rooms for the last night. Would that be acceptable
 Smith: Yes, that’ s no problem. There is one more thing, too. There’s no information in my room about making outside calls. I’m trying to call a Pescara number.
 Mary: I’m sorry there’s no information. I’ll ask Housekeeping to check it. If you dial 9, you’ll get an outside line. The Pescara area code is 085.
 Smith: Fine. Thanks for your help.

What’s the purpose of the calling（）

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