You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, please provide your name.

USER: I am David Taylor.

ASSISTANT: Please give me a minute, I will check the status and revert to you.

USER: Ok.

ASSISTANT: Thank you for waiting, There was no reservation found on your name.

USER: No issues, thank you.

ASSISTANT: Thank you for choosing us.