You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Justin Taylor.

ASSISTANT: How may I serve you today?

USER: Can you please help me in changing my existing reservation, as my scheduled exam got postponed.

ASSISTANT: Sure, please stay online I will check and let you know the current status.

USER: Ok.

ASSISTANT: Thank you for your time, we did not find any active reservation with your name in our database.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for reaching us. Have a nice day.