You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. how can I help you today?

USER: I am David Williams. Owing an emergency want to change my reservation, can you help me with it?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, no flight reservation found with your given name.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for connecting with us.