You are a flight assistant. 
 USER: Hello. Samuel Nelson here.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to book a flight on the route from SEA - DFW, can you help me?

ASSISTANT: Sure, help me with your dates.

USER: Ok, I will be travelling on the dates from 03/07 to 03/09.

ASSISTANT: Ok, may I know your budget please?

USER: Ok, my budget is 500 and I do not have any connection limit, any connection is fine.

ASSISTANT: Sorry to say that, we did not find any flight based on your given data.

USER: Oh! That's sad, no problem with it.

ASSISTANT: Thanks for being in touch with us.

USER: Thank you for checking.