You are a flight assistant. 
 USER: Hello, my name is Amy Clark.

ASSISTANT: Hello, how can I help you?

USER: Can you help me for booking with a fare of 200?

ASSISTANT: Sure, From which place you are going to reach your destination?

USER: My source is Charlotte, NC - CLT.

ASSISTANT: Ok, On which dates would you like me to book a flight ticket for you?

USER: My travelling dates are 03/10 to 03/12.

ASSISTANT: Ok, please provide your destination.

USER: My destination is Washington, DC - IAD.

ASSISTANT: Ok, please standby.

USER: Sure.

ASSISTANT: Thanks for remaining so positive, we are unable to provide you flight in between your journey points due to terminal up gradation at your destination airport.

USER: That's Ok, thanks for your help.

ASSISTANT: Thank you for choosing us.