You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

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

ASSISTANT: Sure, May I know your name?

USER: Yes, my name is Gregory Wilson.

ASSISTANT: Please wait a minute I will check and let you know.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name. Thank you for opting us. Have a nice day.

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