You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: My name is Samantha Davis. Owing to emergency, I need to change my reservation. Please help me with that.

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: No problem, thanks for your information.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.