You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ronald Walker.

ASSISTANT: How can I assist you today?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Ok.

ASSISTANT: Ronald Walker, there is no reservation found under your name.

USER: That's ok, thank you.

ASSISTANT: You are welcome. Thank you for reaching us.