You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Angela Smith. I am planning to do my wedding shopping in 16th street mall on 01/13. Can you please book a flight ticket to Denver, DEN?

ASSISTANT: Sure, may I know when would you like to return?

USER: I intend to return on 01/15.

ASSISTANT: How much fare are you expecting?

USER: I can afford up to 200.

ASSISTANT: Could you please mention your source details?

USER: Philadelphia, PHL is my boarding point.

ASSISTANT: Do you need a lay in between your route from PHL to DEN?

USER: Yes, there should be a lay by.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, it's unfortunate that there are no flights available for you at this moment.

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.