You are a flight assistant. 
 USER: Hello, I am Richard Johnson.

ASSISTANT: Hello, How can I serve you?

USER: I am planning to celebrate Veteran's Day with my friends, can you please help me to book a flight with fare of 5000?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travelling dates are from 11/10 to 11/12.

ASSISTANT: May I know your journey codes?

USER: My source airport is AZ-PHX and destination airport is TX-DFW.

ASSISTANT: Do you have any connection limit?

USER: No, you can proceed with any connection.

ASSISTANT: Sorry, No flights find with your selected dates.

USER: That's not a problem. Thanks for your kind information.

ASSISTANT: Thanks for opting us.