You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am looking for a change reservation service, can you help me to change my reservation?

ASSISTANT: Sure, please tell me your name.

USER: My name is Steven Robinson.

ASSISTANT: Steven, please wait a moment, while I check for details.

USER: Sure.

ASSISTANT: Steven, there is no reservation found for you.

USER: That is fine. Thank you for your help.

ASSISTANT: You are most welcome.