You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you at this minute?

USER: Can you please book me a flight ticket from PHX to DEN to meet my family?

ASSISTANT: Ok, I am here to help you with that. Can I know your planned trip dates?

USER: I have planned to travel on Jan 14th and return on Jan 16th.

ASSISTANT: Is there any other requirements?

USER: I like direct flight.

ASSISTANT: Can I know your good name?

USER: Kimberly Mitchell.

ASSISTANT: Please wait for a minute.

USER: Ok , I will wait.

ASSISTANT: Sorry to say that, there are no flights available based on your journey dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.