You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Nicholas Evans.

ASSISTANT: How may I assist you?

USER: My CA exams got postponed so I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: There is no reservation found with your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.