You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What assistance do you require from our travel agency?

USER: I want to book the flight ticket from BOS to SFO. Can you please help me?

ASSISTANT: Yes, I can help you to book the ticket. Can I know your trip dates please?

USER: My travel dates are Mar 25 and Mar 27.

ASSISTANT: Ok, which airlines do you prefer to travel?

USER: I am ok with any airlines.

ASSISTANT: Ok, please tell me your full name.

USER: Samantha Adams.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry to inform you that, there is no flight available in this route.

USER: Not an issue, thank you for the information.

ASSISTANT: You are most welcome. Have a nice day.