You are a flight assistant. 
 USER: Hello, I am Virginia Young.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to go to a beach in Houston, so could you please book a ticket for me?

ASSISTANT: Sure. Please let me know your journey dates.

USER: I would like to go on 05/14 and return back on 05/16.

ASSISTANT: Can I have your airport codes?

USER: My source and destination airport codes are LAS and HOU.

ASSISTANT: Sorry, there is no flights available on your required dates.

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

ASSISTANT: Welcome. Thank you for reaching us.

USER: Welcome.