You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Debra King here.

ASSISTANT: King, how may I guide you?

USER: I want to book a flight ticket from New York. Could you please help me with booking a flight ticket?

ASSISTANT: Sure King, I am here to help you with that. Can you please share me your source airport code and destination airport code?

USER: My preferable source and destination codes are LGA and HOU?

ASSISTANT: When would you like to travel?

USER: I want to start my journey on 04/22 and return back on 04/24.

ASSISTANT: Just a moment.

USER: Sure.

ASSISTANT: King, sorry to inform that no flights are available on your prefer dates.

USER: Ok, no problem.

ASSISTANT: You are welcome, thank you very much for contacting us.

USER: Thank you for searching.