You are a flight assistant. 
 USER: Hello. I am Linda Mitchell.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation as my exam got postponed. Please help me out.

ASSISTANT: Sure, we are here to help you. Wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting there is no reservation found on your name.

USER: No issues, thank you.

ASSISTANT: Thanks for approaching us.