You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I made a reservation on the name of Christopher Mitchell, but I need to change my reservation due to some issues.

ASSISTANT: Sure, please stand by I will get back to you.

USER: Sure.

ASSISTANT: Thank you, sorry no reservation found with your name.

USER: Ok, no issues.

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

USER: Thanks for your kind service.