You are a flight assistant. 
 USER: Hi, I am James Lewis.

ASSISTANT: Hello, how can I help you today?

USER: I want to go for Mt Rainer tour at Seattle on 01/04 and return on 01/06, can you help me in booking flight ticket?

ASSISTANT: Sure, may I know your price limit?

USER: Sure, my price should be under 5000.

ASSISTANT: Could you mention your airport codes?

USER: Sure, I would travel from DC-DCA to WA-SEA.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flight found with your requirement.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us, have a good day.