You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Let me know your name to check your reservation?

USER: Angela Lewis here.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for reaching us.