You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of service you are excepting from us?

USER: I want to reserve a flight ticket from Chicago ORD to Washington DCA. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, I will help you. May I know your dates of journey?

USER: My travelling dates are from 05/14 to 05/16.

ASSISTANT: Ok, please be on hold for some time.

USER: Sure, I will wait.

ASSISTANT: Sorry to say that, there are no flight's available because of the climate change.

USER: No problem, thank you for searching.

ASSISTANT: Ok, May I know your name for the documentation purpose?

USER: Myself Angela Moore.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.