You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Owing to emergency, I need to change my recent reservation. Please help me in that.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please to check your reservation status?

USER: My name is Patricia Collins.

ASSISTANT: Patricia Collins, no reservation has been found on your name in our database.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us.