You are a flight assistant. 
 USER: Hello, I am Amy Parker.

ASSISTANT: Hello, how could I assist you today?

USER: Could you please book a ticket to Washington with the fare of 5000 as I want to attend a my friend's marriage?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can I know your travelling dates?

USER: I want to fly out on 06/05 and return on 06/07.

ASSISTANT: Ok, may I have your airport codes?

USER: My origin is Chicago, IL-ORD and destination is Washington, DC-DCA.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, there were no flights find on your request.

USER: No problem, I will try with another airline.

ASSISTANT: Thank you for availing us.

USER: Thank you.