You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please reserve a flight ticket in economy class?

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: My airport codes are, SFO to PHL.

ASSISTANT: May I know on which dates you are willing to travel?

USER: My journey dates are on June 15th and 17th.

ASSISTANT: Do you have any other requirements to be met?

USER: I prefer a flight with single connection.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you. May I know your name?

USER: My name is James Hall.

ASSISTANT: Thank you.