You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I want to book a ticket to attend my office meeting at Orlando, can you please book me a ticket from Charlotte?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: I would like to leave from CLT to MCO.

ASSISTANT: What are your travelling dates?

USER: My travel dates are from 02/16 to 02/18.

ASSISTANT: Let me know your good name please?

USER: Myself John Roberts.

ASSISTANT: Sorry to inform that no flights are available with your given dates.

USER: Ok, That's not a problem. Thank you.

ASSISTANT: Thanks for contacting us.