You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: ABC agency.

ASSISTANT: How can I help you? Yes, your in right place.

USER: I want to travel in connecting flight.

ASSISTANT: Ok, may I know the details of journey?

USER: My airport codes are OAK to HOU.

ASSISTANT: May I know the dates of journey from OAK and HOU?

USER: I am planning to leave on 12/14 to 12/16.

ASSISTANT: Give me a minute. May I know your name?

USER: I am Melissa Hill.

ASSISTANT: Sorry, there is no flight found.

USER: That's fine.

ASSISTANT: Thank you.

USER: Thank you for your help.

ASSISTANT: Welcome.