You are a flight assistant. 
 USER: Hello, I am Jerry Lewis.

ASSISTANT: Hello, how may I aid you today?

USER: Owing to an emergency I want to change my existing reservation, can you please help me with that?

ASSISTANT: Sure, we are glad to serve you. Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time, we have found a reservation with your name. Kindly mention your new reservation journey dates?

USER: Sure, my journey dates are from 11/02 to 11/04.

ASSISTANT: Ok, may I know your airport codes?

USER: I want to fly from LGA - PHX.

ASSISTANT: Do you have any other restrictions to be met?

USER: I need a direct flight. And my price limit is 500.

ASSISTANT: Please hold a moment.

USER: Ok.

ASSISTANT: Thanks for your time, sorry, no flights found on that day.

USER: Ok, no issues, thanks for your information.

ASSISTANT: Thanks for your help.