You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of help that you need from our agency?

USER: Myself Betty Clark. I want to book a ticket from San Francisco.

ASSISTANT: Sure, I am oblige to help you. Can you please provide me the journey dates that you have planned?

USER: I am planning to start my trip on 06/24 and return back on 06/26.

ASSISTANT: Ok, can I know your source and destination region airport codes of your journey?

USER: Source from SFO to Destination DEN.

ASSISTANT: Please give me a moment, so that I can check the flight on your dates.

USER: Ok, take your time.

ASSISTANT: Sorry to say that, there are no flights that are moving on your dates to book your ticket.

USER: Ok, no problem. Thank you.

ASSISTANT: You are most welcome and thank you for reaching us.