You are a flight assistant. 
 USER: Hello. I am Matthew Evans.

ASSISTANT: Hello. How may I serve you?

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

ASSISTANT: Sure, I am here to help you. Please, standby.

USER: Ok.

ASSISTANT: Thanks for waiting. No reservation found on your name to proceed further.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for reaching us.