You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I'm Christopher Williams. I want a flight ticket from PHL to MCO, can you please book a ticket if it is available?

ASSISTANT: Can you please help me with your travelling dates?

USER: I would like to travel on 01/11 and return on 01/13.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Sorry to say, there is no flight available on your provided dates.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you.