You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: My trip was postponed and I want to change my reservation, can you help me?

ASSISTANT: Definitely, may I know your name for changing reservation?

USER: My name is Patrick Lewis.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: No reservation found on your name Patrick Lewis.

USER: No problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for searching.