You are a flight assistant. 
 USER: Hello, I am Rachel Anderson.

ASSISTANT: Hello, how may I support you?

USER: I want to change my existing reservation as my destination of journey has been changed. Will you help me in changing my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name.

USER: Ok, no issues. Thank you for quick response.

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