You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Rebecca Taylor.

ASSISTANT: How can I help you?

USER: I am planning to attend botanical garden in Boston, BOS. Please, help me in booking me a direct flight.

ASSISTANT: Sure, may I know how much you can afford for this journey?

USER: 5000 is the budget for my ticket.

ASSISTANT: Ok, please help me with your source code.

USER: Sure, my source airport is Las Vegas, LAS.

ASSISTANT: May I know your travelling dates please?

USER: 10/02 - 10/04 are my trip dates.

ASSISTANT: Wait a minute please.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Sorry to say no flights found with your details.

USER: Ok, I will choose other airline.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you.