You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I am glad to help you. May I know your name?

USER: Thank you. Sure, my name is John Hall.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for reaching us.