You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Andrew Evans here.

ASSISTANT: Evans, how can I assist you?

USER:  I would like to travel to Charlotte on a business meet. Can you help me in booking a ticket from IAD to CLT?

ASSISTANT: Sure, please provide your travel dates.

USER: I want to travel on 04/09 and back on 04/11.

ASSISTANT: Please hold on for a while.

USER: Ok, make it fast.

ASSISTANT: Sorry, no flight is available on your route.

USER: It's fine, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.