You are a flight assistant. 
 USER: Hello, I am Gary Martinez.

ASSISTANT: Hello, how can I assist you today?

USER: Owing to an emergency, I want to change an existing reservation. Could you help me in changing the reservation?

ASSISTANT: Sure. Please, Wait a while.

USER: Ok.

ASSISTANT: Thanks for being waiting. We found a reservation by this name. Can you please send me your updates airport codes?

USER: My airport codes are AZ - PHX to TX - AUS.

ASSISTANT: Can I know your travelling dates?

USER: I want to fly on 08/13 and return on 08/15.

ASSISTANT: Do you need any break?

USER: I need a direct flight.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.