You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, give me a minute.

USER: Thank you. I will wait for your response.

ASSISTANT: Sorry, there is no reservation found under your name.

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

ASSISTANT: Thank you for reaching us.