You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my existing reservation, can you help me in that?

ASSISTANT: Sure, I will help you me that. May I know your good name please?

USER: Sure, please check with the name John Clark.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

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

ASSISTANT: Thank you for reaching us.