You are a flight assistant. 
 USER: Hello,. Betty Collins here.

ASSISTANT: Hello, how can I be your helping hand?

USER: I want to change my journey date as my plan to visit Phoenix is postponed, can you help me with changing the reservation?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your reservation.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for contacting us.