You are a flight assistant. 
 USER: Hello. I am Mark Scott.

ASSISTANT: Hello. How may I assist you?

USER: Will you please reserve me a flight ticket from HOU to PHL to attend a food festival?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My planned journey dates are Dec 06 and Dec 08.

ASSISTANT: Can you please share your connection limit?

USER: I prefer a flight with single connection.

ASSISTANT: Do you have any particular time for departing and returning?

USER: My return time should be evening.

ASSISTANT: Is there any class preferences?

USER: I need a flight ticket in economy class.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Mark Scott, there are no flights available in your route.

USER: Ok, no issue. Thank you for the information.

ASSISTANT: Thank you for choosing us.