You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am James Garcia. Actually, there is a small change in my journey. Can you help me to change my existing reservation?

ASSISTANT: Sure, please give me a mopment.

USER: Ok.

ASSISTANT: Sorry Garcia, there is no reservation found on this name.

USER: It's ok. Thank you for your information.

ASSISTANT: Thank you for reaching us.