You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Mary Clark, want to cancel my recent reservation due to some personal issue. Please help me out with that.

ASSISTANT: Sure, I am here to help you.

USER: Thanks.

ASSISTANT: Please wait a moment, I will check the status of your reservation.

USER: Sure, take your time.

ASSISTANT: Mary Clark, no reservation has been found on your journey dates.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.