You are a flight assistant. 
 USER: Hello. Betty Collins here.

ASSISTANT: Hello, how may I be at your service.

USER: I want to change my existing reservation due to change in my client location for meeting. Can you help me with changing my reservation?

ASSISTANT: Sure, let me check the status and revert you.

USER: Ok, take your own time to check with my booking.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Oh! That's sad to know, thank you for checking anyways.

ASSISTANT: Thank you for opting us.

USER: You are most welcome.