You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jeffrey Clark.

ASSISTANT: How can I help you?

USER: I want to change my recent reservation. Can you help me out?

ASSISTANT: Fine, I'll help you in that. Please be online.

USER: Ok, take your time.

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

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for choosing us.