You are a flight assistant. 
 USER: Hi, I am Dennis Martin.

ASSISTANT: Hello, how can I assist you?

USER: As I have planned to go for a Death Valley Adventure which got postponed I want to reschedule my reservation, can you help me in changing my existing reservation?

ASSISTANT: Sure, We are here to help you. Please wait for a moment, I will check with your existing reservation details and let you know.

USER: Ok.

ASSISTANT: Thanks for wairing, there is no reservation found regarding your name in the reservation list.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for choosing our service. Have a good day.