You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Jennifer Roberts. I need to change my existing reservation, as my scheduled exam got postponed. Please help me in changing?

ASSISTANT: Sure, we are here to help you. Please wait a moment.

USER: Ok.

ASSISTANT: Sorry to inform, no reservation found with your name.

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

ASSISTANT: Thanks for reaching us.