You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark Hall.

ASSISTANT: How may I help you today? Nice to meet you Mark.

USER: I just want to cancel my recent reservation because my business trip postponed, can you help me for that.

ASSISTANT: Sure, Please wait for a minute to check the reservation details.

USER: Ok.

ASSISTANT: Sorry Mark, I cannot find any reservation with your name.

USER: Ok it's fine.

ASSISTANT: Thanks for contacting us.

USER: Thank you for your services.

ASSISTANT: It's my pleasure.