You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to attend my brother's marriage.Can you please help me in booking the ticket?

ASSISTANT: May I know your travelling dates and place?

USER: Sure, the travelling dates are from 10/07 to 10/09. The travelling details are from TX-IAH to DC-IAD.

ASSISTANT: Sorry to say that there is no flight found.

USER: OK, It's fine. Thank you.

ASSISTANT: May I know your name please?

USER: Sure, my name is Nancy Parker.

ASSISTANT: Thank you for contacting us.