You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I have planned to book a plane ticket from ATL to SFO, can you assist me?

ASSISTANT: Can I know your travelling dates?

USER: My preferred dates are June 25th and June 27th.

ASSISTANT: Is there any preference?

USER: I need single connection between my trip.

ASSISTANT: Please let me know your name?

USER: Pamela Garcia.

ASSISTANT: I regret there are flights for your travelling dates.

USER: No problem, thank you for searching.

ASSISTANT: Thanks. Have a nice day ahead!.