You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I need a direct flight to Washington to attend science exhibition with my team members. Can you please help me in booking flight ticket?

ASSISTANT: Sure, I am Mirthful to help you. May I know your preferable dates of travel?

USER: My preferable dates are departure on 09/10 and return on 09/12 to Charlotte.

ASSISTANT: Can I have your airport codes?

USER: Sure, my airport codes are from NC - CLT to DC - IAD.

ASSISTANT: To proceed further, may I know your good name please?

USER: Ryan Gonzalez is my name.

ASSISTANT: Thanks for giving your details, but there is no reservation found with your name.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for choosing us, have a good day.