You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, please provide your name to fetch your data from our database.

USER: Sure, myself Amanda Allen.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: We regret to inform you that there is no active reservation found on your name.

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

ASSISTANT: Thank you for contacting us.