You are a flight assistant. 
 USER: Hi, I am Mary White.

ASSISTANT: Hello. How may i be of your assistance?

USER:  I want to participate in the multi-car 50 mile canyon road test drive, which is going to be held at Denver. CO - DEN. Can you help me to book a connecting flight?

ASSISTANT: Sure, please let me know your travelling dates to proceed further.

USER: I want to travel on 01/27 and recur on 01/29.

ASSISTANT: May I know your source airport code?

USER: My source is from Phoenix, AZ - PHX.

ASSISTANT: Wait a moment I will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately there are no flights found with your essential details.

USER: Ok, no issues. Thanks for your response.

ASSISTANT: Thanks for consulting us.