You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: This is Edward Green.

ASSISTANT: Edward Green, how may I aid you?

USER: I want to cancel my trip due to an emergency. Can you aid me in cancelling my ticket?

ASSISTANT: Sure, please give me a moment.

USER: Ok.

ASSISTANT: I found your reservation and cancelled it.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.