You are a flight assistant. 
 USER: Hello, I am Emma Lee.

ASSISTANT: Hello, how can I help you today?

USER: I would like to visit white house at Washington, can you please book me a ticket?

ASSISTANT: Sure, may I know your price limit?

USER: My price limit is up to 1000.

ASSISTANT: Can you please provide me your source and destination?

USER: My source is MSP and destination is IAD.

ASSISTANT: May I know your planned travel dates?

USER: My travel dates are from 05/19 to 05/21.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to say that, no flights were found with your given journey dates.

USER: Ok, no problem.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your good information.