You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Karen Anderson here.

ASSISTANT: Karen, how may I help you?

USER: I would like to change my reservation because my cousin met with an accident. Can you help me?

ASSISTANT: Sorry to hear that. Please give me a moment to check your ticket status.

USER: Sure.

ASSISTANT: Sorry, no reservation is available by your name.

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.