You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Justin Green.

ASSISTANT: How may I assist you today?

USER: I am planning to change my reservation to another destination, so can you help me to change my reservation?

ASSISTANT: Sure, please wait for a minute. Sorry, there is no reservation matching with your name in our portal to change further.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: My pleasure.