You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Nicholas Evans.

ASSISTANT: How may I help you?

USER: I need to modify my reservation, can you help me out please?

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

USER: Sure, take your won time.

ASSISTANT: Thanks for your time, there is no reservation with your name.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Thanks for choosing us.