You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I am Timothy Clark. I am planning to visit Houston Zoo in IAH, can you help me in booking the ticket from PHL?

ASSISTANT: Sure, we are here to help you.

USER: Thanks.

ASSISTANT: D you need any connecting flight?

USER: I need a flight with 1 connection.

ASSISTANT: May I have your airport codes please?

USER: My airport codes are PHL and IAH.

ASSISTANT: Sorry, mention your travel dates.

USER: My planning dates are from 11/03 to 11/05.

ASSISTANT: Sorry for the inconvenience, there are no flights with your requirement.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you.