You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emily Robinson.

ASSISTANT: How can I help you Emily Robinson?

USER: I have planned to travel from DCA to PHL for attending seminar, can you please help me in booking my ticket?

ASSISTANT: Sure, can you please help me with your journey dates?

USER: My travel dates are from 10/13 to 10/15.

ASSISTANT: Wait a moment please, I am checking with the availability.

USER: Sure.

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

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

ASSISTANT: Welcome.