You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patricia King.

ASSISTANT: How can I help you?

USER: I am looking for a 1 stop over flight from IAD to DEN, can you help me out please?

ASSISTANT: Sure, I'll help you in that. May I know your travel dates please?

USER: My trip dates are from 04/10 till 04/12.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.