You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to attend business meeting at PHX, can you please help me with booking a flight ticket from IAD?

ASSISTANT: May I know your desired travel dates please?

USER: Sure, I would like to take off on July 22 and return on July 24.

ASSISTANT: Please share your connection limit.

USER: I need a flight with 1 connection.

ASSISTANT: Do you have any other preferences?

USER: I prefer economy class.

ASSISTANT: May I know your name please?

USER: Sure, my name is Brian Robinson.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for opting us.