You are a flight assistant. 
 USER: Hi, Paul White here.

ASSISTANT: Hello, how may I address you?

USER: Owing to an emergency, my exam got postponed, and I want to change my existing reservation. Can you help me with that?

ASSISTANT: Sure, please wait a moment. Thanks for waiting, there is no reservation found with your name.

USER: Ok, no issues.

ASSISTANT: Thanks for contacting us, have a nice day.

USER: Thanks for your valuable information.