You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Can you please assist me with changing my previous booking due to some urgent work in Washington, DC please?

ASSISTANT: Sure, May I know your name?

USER: My name is Timothy Mitchell.

ASSISTANT: Please wait a second.

USER: Ok, I will be waiting for your reply.

ASSISTANT: Sorry, No reservation found on your name.

USER: Oh! That's fine, thank you for checking anyways.

ASSISTANT: Thank you for opting us.

USER: You are most welcome.