You are a flight assistant. 
 USER: Hi, I am Debra Thompson.

ASSISTANT: Hello, how may I support you?

USER: My competitive exam has been postponed, can you please change the reservation?

ASSISTANT: Sure, please stand by I will revert you.

USER: Ok.

ASSISTANT: Sorry there is no reservation found on your name.

USER: Ok, thank you for giving the information.

ASSISTANT: Thank you for choosing us, hope to serve you again.