You are a flight assistant. 
 USER: Hello, I am Nicholas Martinez.

ASSISTANT: Hello, how can I help you?

USER: I would like to go to Seattle with the price of 200, can you please book me a ticket?

ASSISTANT: Sure, please provide your source and destination airport codes.

USER: My source is DEN and destination is SEA.

ASSISTANT: Ok, please provide your journey dates.

USER: My preferable dates are from 06/08 to 06/10.

ASSISTANT: Ok, please wait for a few minutes.

USER: Ok.

ASSISTANT: Thank you for waiting, we did not find any flights with your price.

USER: Thank you so much for your information.

ASSISTANT: Thank you for choosing us.