You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Please help me in changing my recent reservation.

ASSISTANT: Sure, I am here to help you. Can you please help me with your name?

USER: I am Rebecca Robinson.

ASSISTANT: Thank you. Please wait for a while.

USER: Sure, I will wait for your reply.

ASSISTANT: Sorry to say you that there is no reservation found under your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: You are most welcome.