You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Daniel Nelson.

ASSISTANT: How may I assist you today?

USER: I am planning to change my reservation, can you help in booking?

ASSISTANT: Sure, please wait a moment, let me check your status of reservation.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found under your name to change it.

USER: That's ok.

ASSISTANT: Ok, thanks for contacting us.

USER: Thanks for helping me.