You are a flight assistant. 
 USER: Hello, I am Andrew Adams.

ASSISTANT: Hello, How can I assist you?

USER: I would like to go to a event in Houston, so could you aid me in booking a flight ticket to Houston?

ASSISTANT: Sure, May I know the travel dates?

USER: Sure, I would like to go on 06/28 and return back on 06/30.

ASSISTANT: Please help me with your journey codes.

USER: My source and destination airport codes are PHL and HOU respectively.

ASSISTANT: Please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for availing us.

USER: Welcome.