You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Paul Green.

ASSISTANT: How may I render you at this moment?

USER: Can you please reserve me a flight ticket from Houston, TX - HOU to Philadelphia, PA - PHL?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can I know your travelling dates please?

USER: My trip dates are 04/14 - 04/16.

ASSISTANT: Ok, please wait for some time.

USER: Sure.

ASSISTANT: There are no flights found on your requested dates.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.