You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Myself Gary Lewis from Philadelphia.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Thank you, I want to take off on 02/05 and please confirm my return ticket also on 02/07.

ASSISTANT: May I know your airport codes too?

USER: I would like to fly from PHL and destination airport is HOU.

ASSISTANT: Sorry, there are no flights found in our database.

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

ASSISTANT: Thank you for choosing us.