You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Amanda Martin. I need to change my existing reservation because my bank exams got postponed. Can you please help me with that?

ASSISTANT: sure, please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to inform that there is no reservation found with your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your quick response.