You are a flight assistant. 
 USER: Hi, Christine Walker here.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in booking a flight from DEN to reach Phoenix?

ASSISTANT: Sure, please provide your class preference.

USER: I don't have any preference.

ASSISTANT: Ok, when do you want to travel?

USER: I am willing to start on July 1st in evening time and return on 3rd July.

ASSISTANT: Ok, Do you prefer direct flight or connected flight?

USER: I prefer a connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, No flights were found with your given requirements.

USER: No issues, thank you.

ASSISTANT: Thank you for approaching us.