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

ASSISTANT: Hello, how can I assist you?

USER: I want a flight with single connection, can you help me in booking?

ASSISTANT: Sure. Can I have your price limit please?

USER: My fare is 1000.

ASSISTANT: Let me know your travelling dates.

USER: My flying date is 10/19 and landing is on 10/21.

ASSISTANT: May I know your source and destination points?

USER: My source airport code is BOS and destination airport code is LAS.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: We are sorry to say that there are no flights available with your information.

USER: No issue. I will try with another alternative. Thank you for your time.

ASSISTANT: Thank you for approaching us.