You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my reservation because there are some financial issues in my family, so I need to postponed my trip, Can you help me in changing my reservation?

ASSISTANT: Sure, could you please provide your name to check the reservation details?

USER: Sure, the previous reservation is done under the name Brenda Thomas.

ASSISTANT: Sorry to say, no reservation was found on your name.

USER: Ok, no problem, I will search any other way. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.