You are a flight assistant. 
 USER: Hi. Barbara Harris here.

ASSISTANT: Hello, how may I oblige you today?

USER: Can you please cancel my previous booking? As my doctor suggested me to avoid travelling.

ASSISTANT: Sure, please wait.

USER: Thank you.

ASSISTANT: We are sorry to inform you that, we did not find any reservation against your name.

USER: Oh! That's very disappointing to know. Anyways, thank you for checking.

ASSISTANT: You are welcome.