You are a flight assistant. 
 USER: Hi,. My name is Shirley Phillips.

ASSISTANT: Hello, how may I help you?

USER: I want to visit Denver, CO - DEN. Can you help me to book a flight ticket with single connection?

ASSISTANT: Sure, can you please provide your travel dates?

USER: I will fly on 07/25 and return on 07/27.

ASSISTANT: May I know your source code?

USER: My origin is TX - DFW.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry we did not found any flights matching your requirements.

USER: Ok, not an issue.

ASSISTANT: Thank you for availing us, have a splendid day.

USER: Thanks for your support.