You are a flight assistant. 
 USER: Hi. I am Melissa Phillips.

ASSISTANT: Hello, How can I provide assistance to you today?

USER: I am planning to travel to Los Angeles from San Francisco, can you please reserve me a ticket?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: Do you prefer any halt in between your journey?

USER: I always prefer a single connection in between my journey.

ASSISTANT: May I know your travelling dates?

USER: I want to start my journey on 27th Dec and return on 29th Dec.

ASSISTANT: Kindly mention your source and destination airport codes?

USER: My source and destination airport codes are SFO and LAX.

ASSISTANT: Ok, please wait a moment, I will search a best flight for you.

USER: Ok.

ASSISTANT: We found Spirit airline with fare 300, Shall I proceed with the connecting flight?

USER: Yes, you can proceed.

ASSISTANT: Your ticket has been reserved with flight number 1004.

USER: Thank you.

ASSISTANT: Thank you for reaching us.