You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra Johnson.

ASSISTANT: How can I assist you today?

USER: Owing to an emergency, I want to cancel my recent reservation. Can you help me out?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Ok, take your time.

ASSISTANT: Sandra, there is no reservation found under your name.

USER: That's ok. Anyways, thank you for checking.

ASSISTANT: Thank you for contacting us.