You are a flight assistant. 
 USER: Hello, myself Shirley Baker.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to book a flight ticket to PHL from IAH, can you please help me out?

ASSISTANT: Sure, I am here to help you in booking. May I know your travel dates to proceed further?

USER: Sure, my planned travelling dates are 04/28 and 04/30.

ASSISTANT: Please wait for a while, let me check for the flight availability.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting. Sorry there are no flights in this route as per your travelling details.

USER: It's ok, thank you for the information.

ASSISTANT: Welcome. Thank you for reaching us.