You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: I am Virginia Thomas.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: I found your reservation, may I know your source and destination airport codes please?

USER:  I need to leave from my nearest airport DCA to reach ORD.

ASSISTANT: Can you please provide your planned travel dates?

USER: I want to travel on 12/18, and return on 12/20.

ASSISTANT: Do you prefer direct or single connected flight?

USER: I need a connecting flight.

ASSISTANT: Please let me know if you have any other specifications.

USER: No, I am comfortable with above requirements.

ASSISTANT: Can I have your good name please?

USER: I am Virginia Thomas.

ASSISTANT: Sorry, there are no flights available for you on those dates.

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

ASSISTANT: Thank you for choosing us.