You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sarah Evans here.

ASSISTANT: Sarah, how may I help you?

USER: Can you help me to change my recent reservation because of some personal issue?

ASSISTANT: Sure, please give me a moment to check your ticket status. Sorry, no reservation is available on your name.

USER: Sure, take your own time. That's fine, thanks for your information.

ASSISTANT: Thank you for contacting us.