You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you at this moment?

USER: My exams got postponed, can you please help me in changing my existing reservation?

ASSISTANT: Sure, may I know your good name please?

USER: I am Patricia Scott.

ASSISTANT: Ok, please wait for few minutes.

USER: Ok.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you.