You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Christopher Wright.

ASSISTANT: Welcome to RJY travel agency, how may I assist you Wright?

USER: I want to do some changes in my existing reservation because I didn't get the concert tickets, so planning to travel on another date, can you please help me?

ASSISTANT: Please give me a moment, let me check your details.

USER: Sure.

ASSISTANT: Sorry Christopher, there is no reservation found with your details.

USER: That's ok, no issues. Thank you for the information.

ASSISTANT: Do you want any other help from our agency?

USER: No, thank you for asking.

ASSISTANT: Thank you for contacting us, I hope our agency will serve you in the future.

USER: Thank you.

ASSISTANT: Most welcome.