You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Richard Adams. Please help me in changing my existing reservation, as my exam scheduled has been postponed. Will you help me in changing?

ASSISTANT: Sure, we are here to help you. Wait for some time.

USER: Ok.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for choosing us.