You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: Can you help me to change my recent reservation because  my trip dates are got postponed?

ASSISTANT: Sure, may I know your good name?

USER: I am Christopher Parker.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your own time.

ASSISTANT: I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.