You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, I am glad to help you and can you please mention your name please?

USER: I am Margaret Hill.

ASSISTANT: Thank you for waiting, please allow me a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, the is no flight reservation found for the user name in our back end to change your booking.

USER: Ok, not a problem.

ASSISTANT: You are most welcome and thank you for approaching us.

USER: Thanks for your help.