You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Sarah Carter here.

ASSISTANT: Sarah, how may I aid you?

USER: I want to cancel my flight reservation as I am unwell, can you please do that for me?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Ok, I will wait for your response.

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

USER: That's fine, thank you for checking.

ASSISTANT: Thank you for reaching us.