You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER:  Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me with changing?

ASSISTANT: Sure, we are rapturous to help you in changing your ticket.

USER: Thank you for considering my request.

ASSISTANT: Let me know your name to check your reservation?

USER: Sure, Daniel Wilson is my name.

ASSISTANT: Please be on hold, I will check the status of your reservation and let you know.

USER: Ok, I will wait for your response.

ASSISTANT: Thanks for your valuable time.

USER: My pleasure.

ASSISTANT: Sorry Daniel, there is no active reservation found on your name to change it.

USER: That's Ok, I think my friend has booked my ticket at another agency. May be it will found there. Anyway, thanks for your effort.

ASSISTANT: Thank you for reaching us with a query, We hope to serve you again.

USER: You have done a great job with checking my reservation.

ASSISTANT: Have a cheerful day!.