You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Emily Lewis.

ASSISTANT: How can I aid you?

USER: I am planning to attend a food festival which is going to be held at San Francisco, can you please book me a flight ticket with single connection?

ASSISTANT: Sure, can I know your scheduled travel dates?

USER: Yes, I would like to go on 02/18 and return back on 02/20.

ASSISTANT: Help me with your airport codes please?

USER: I want to fly from JFK to SFO.

ASSISTANT: Please wait for a second.

USER: Ok.

ASSISTANT: Sorry, there were no flights found with your given preferences.

USER: Not an issue, thank you.

ASSISTANT: Thanks for contacting us.