You are a flight assistant. 
 USER: Hello, I am Robert Scott.

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

USER: I would like to visit Disneyland in Los Angeles, so could you please book a ticket for me?

ASSISTANT: Can I know your dates of travelling.

USER: I would like to go on 04/09 and return back on 04/11.

ASSISTANT: Please send your airport codes.

USER: My airport codes are DFW and LAX.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no flights are available on this route.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.

USER: Welcome.