You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I serve you?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I can help you. May I know your name?

USER: Sure, I am Gregory Hall.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thanks for your time.

USER: Ok.

ASSISTANT: We didn't found any reservation by this name.

USER: Ok, no issues. Thanks for your response.

ASSISTANT: Thank you for reaching us.