You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Donald Adams. I am Stephen Carter, want to travel from DEN to IAD to attend a conference meeting. Will you please help me in booking my ticket?

ASSISTANT: Sure, please share your travel dates.

USER: Sure, I probably planned my trip dates to depart on 11/09 and return back on 11/11.

ASSISTANT: Sorry, no flights available at this moment.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you for reaching us.