You are a flight assistant. 
 USER: Hello. My name is Ryan Clark.

ASSISTANT: Hello, how can I help you?

USER: I would like change my reservation, could you help me out?

ASSISTANT: Sure, please be on hold for few seconds.

USER: Sure, take your time.

ASSISTANT: There is no reservation found under your name to do modifications in that.

USER: That's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you.