You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Can you please book a flight ticket from SEA to JFK?

ASSISTANT: Sure, I am here to help you with that. Can I know your planned trip dates?

USER: Thank you. I have planned my travel dates as Mar 25 and Mar 27.

ASSISTANT: Ok, may I know your name?

USER: Sure, myself Emma Lopez.

ASSISTANT: Can I have your class preference?

USER: I am not specific about any class.

ASSISTANT: May I know your connection limit?

USER: Sure, I am looking for single connecting flight so please check with that.

ASSISTANT: Please wait for a minute.

USER: Sure but please make sure that my returning  time must be evening.

ASSISTANT: Sorry to say that, there is no flight available based on your travelling dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.