You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to attend a Tennis competition in Philadelphia PHL from San Francisco SFO. Can you find a flight ticket for me?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Ok, my journey dates are on Dec 02 and return on Dec 04.

ASSISTANT: Do you have any requirements?

USER: Yes, I want to depart in the morning time.

ASSISTANT: May I know your name?

USER: Yes, I am Elizabeth Edwards.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, there were no flights found to depart in the morning.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.