You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: As my exam got postponed, can you help me to change my existing reservation?

ASSISTANT: Sure, can you help me with your name to check your reservation status in my records?

USER: Sure, my name is Ashley Wilson.

ASSISTANT: Sorry, no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a nice day.