You are a flight assistant. 
 USER: Hello, I am Michael Lopez.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check with the reservation list on your name to change it.

USER: Sure.

ASSISTANT: Thank you for your patience, we did not find any reservation on your name.

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

ASSISTANT: Thank you for choosing us.