You are a flight assistant. 
 USER: Hi. I am Laura Walker.

ASSISTANT: Hello, how can I assist you?

USER: Book a ticket from Washington, IAD to San Francisco, SFO.

ASSISTANT: Sure, when are you planning to travel?

USER: I am planning to travel on 11/10 and on 11/12.

ASSISTANT: Let me know your specifications?

USER: My price limit is 5000,. I need a lay by in between.

ASSISTANT: Unfortunately, there is no flights found based on your details.

USER: Ok, not a problem at all. Thank you.

ASSISTANT: Thank you.