You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I have to change my ticket  booking, can you please help me in that one?

ASSISTANT: How can I assist you today? Please mention the name for checking the reservation.

USER: Sure, my name is Timothy White.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: Ok,that's fine, thank you for your help.

ASSISTANT: Welcome, have a great day.