You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Nancy Jones. I am planning to travel from IAH to DFW, help me in booing a flight?

ASSISTANT: May I know your travel dates?

USER: My travelling dates are 12/21 to 12/23.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.