You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: I am planning to attend a live concert in Washington on Mar 4th, could you please help me to book a flight ticket?

ASSISTANT: Sure, May I know your airport codes?

USER: Sure, I would like to start my journey from DFW and my destination airport code is IAD.

ASSISTANT: When are you willing to coming back?

USER: I want to return from DC on Mar 6th.

ASSISTANT: Do you have any connection limit?

USER: I prefer to fly with the connecting flight for this time.

ASSISTANT: Are there any preferences?

USER: I I don't have any other preference.

ASSISTANT: May I know your name?

USER: I am Amy Walker.

ASSISTANT: Sorry, there are no flights found with your data.

USER: That's ok, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Ok, Thank you.