You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. May I know your good name please?

USER: I am Edward Gonzalez.

ASSISTANT: I hope you are fine, how can I help you now?

USER: Can you help me with booking a flight from IAD to CLT?

ASSISTANT: Sure, may I know the travelling dates please?

USER: My preferable dates are 05/06 and 05/08.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there are no flights found on your requested dates.

USER: That is fine for me. Thank you for your time.

ASSISTANT: You are welcome.