You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I would like to change my destination airport code, please help me in changing my existing reservation.

ASSISTANT: Sure, I can help you in that. Before that, we need to check your current reservation status. Can you please provide your name?

USER: Sure, my name is Jennifer Walker.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Jennifer, I think something went wrong while you were booking the ticket because there is no reservation found under your name in our database to do changes in that.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a great day.