You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Owing to an emergency I want to change my existing reservation, will you help me in it?

ASSISTANT: Sure, I can help you better.

USER: Thanks.

ASSISTANT: Let me know your name to check the status of your reservation?

USER: My name is Sharon Hill.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: I regret that there is no reservation found on your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.

USER: Have a nice day.