You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER:  Rachel Johnson here.

ASSISTANT: Rachel, how can I assist you?

USER: Can you cancel my recent reservation ticket?

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

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for choosing us.