You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Rebecca Lopez here.

ASSISTANT: How may I guide you today?

USER: I want to cancel my ticket for some personal reason. Can you do this for me?

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: I cancelled your reservation successfully.

USER: Thank you for your service.

ASSISTANT: Thank you for contacting us.