You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, may I know your name?

USER: Christopher Lewis, is my name.

ASSISTANT: Christopher Lewis, which service are you looking for today?

USER: I am going for a Grand Canyon Adventure at San Francisco so, can you avail me flight ticket?

ASSISTANT: Sure, when are you planning to go for adventure?

USER: I am planning to move on 08/20.

ASSISTANT: Do you have price limit for this?

USER: 1000, is my price limit.

ASSISTANT: Can I have your take off and landing airport codes?

USER: I want to board from PA - PHL, Philadelphia. I need to land at San Francisco, CA - SFO.

ASSISTANT: OK, when are you willing to return?

USER: I am willing to return on 08/22.

ASSISTANT: OK, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, I didn't found flight on your dates.

USER: Ok, not an issue. Thanks for your service.

ASSISTANT: Thank you for contacting us.