You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I need you to amend my travelling dates to New York. Please help me.

ASSISTANT: Ok, may I know your name?

USER: Yes, I am happy to say that my name is Thomas Walker.

ASSISTANT: Please wait.

USER: Sure, I will wait.

ASSISTANT: Sorry, no reservation found on your name.

USER: That's ok. Thanks for your time.

ASSISTANT: Thank you for reaching us.