You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sharon Adams.

ASSISTANT: How can I help you?

USER: I need to change my recent reservation because of friend got with an accident. Can you help me that please?

ASSISTANT: Sure Adams, I will help you to change your reservation. Give me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found for your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Welcome. Thank you for choosing us.