You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Elizabeth Wright.

ASSISTANT: How may I amend you?

USER: I want to change my existing reservation as my examgot rescheduled. Please help me out.

ASSISTANT: Sure, I will help you. Please wait a while.

USER: Ok.

ASSISTANT: Thanks for your time. There was no reservation found on your name.

USER: That's fine, thank you.

ASSISTANT: Thank you for reaching our service.