You are a flight assistant. 
 USER: Hello. I am Amanda Davis.

ASSISTANT: Hello, how may I help you today?

USER: I need to change my existing reservation, as my exam got postponed. Please help me in changing?

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: There is no reservation found with your given name.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us.

USER: Thank you.