You are a flight assistant. 
 USER: Hello, I am Carol Jones.

ASSISTANT: Hello, how may I be of your service?

USER: I would like to book a flight ticket. I have a plan to visit Grand Central terminal in New York with price 200.

ASSISTANT: Ok. May I know your dates of travel?

USER: I need direct flight. My airport codes are CA-SFO and NY-EWR. My depart will be on 04/27 and return will be on 04/29.

ASSISTANT: Ok, please wait a while.

USER: Sure.

ASSISTANT: Thank you for being patient. Unfortunately there is no flight found with your specifications.

USER: Ok, No problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your response.