You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Melissa Edwards here.

ASSISTANT: Edwards, how can I assist you?

USER: Can you please help me in booking the ticket from CLT to IAD?

ASSISTANT: Sure, I will help you. Could you please let me know your travel dates?

USER: Sure, my travel dates are 10/10 and 10/12.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, I'll wait.

ASSISTANT: Sorry Edwards, there are no flights available on your preferred dates.

USER: That's ok, thank you for giving the information.

ASSISTANT: You are welcome and thank you very much for contacting us.