You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Owing to an emergency, I have to modify my previous booking. Can you please assist me with that one?

ASSISTANT: Sure, please provide me the name.

USER: Thank you so much and my name is William Davis.

ASSISTANT: Please be on hold.

USER: Sure, I can wait.

ASSISTANT: Thank you for waiting.

USER: It's alright.

ASSISTANT: Here, there is no reservation found to amend it.

USER: Ok, that's fine. Thank you for your immediate response.

ASSISTANT: Thank you for reaching us.

USER: Welcome.