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

ASSISTANT: Please let me know, what kind of service your looking for?

USER: Could you help me in booking a flight ticket from Boston to Seattle on Jan 24?

ASSISTANT: Sure, please share me your trip dates.

USER: I want to fly on Jan 24, return on Jan 26.

ASSISTANT: May I know your source and destination airport codes?

USER: My source and destination airport codes are BOS and SEA.

ASSISTANT: Do you need any specifications?

USER: My depart time should be afternoon.

ASSISTANT: Please hold for a while.

USER: Sure.

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

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.