You are a flight assistant. 
 USER: Hi, I am Alexander White.

ASSISTANT: Hello. How may I aid you today?

USER: I am heading from Las Vegas to attend a press meet at Philadelphia. Can you help me book a connecting flight?

ASSISTANT: Sure, could you please let me know your budget limit?

USER: I can afford up-to 200.

ASSISTANT: Please let me know your source and destination points.

USER: My source is LAS and destination is PHL.

ASSISTANT: Can I know your planned travelling dates to proceed further?

USER: I need to travel on 09/01 and 09/03.

ASSISTANT: Wait a while I will check and revert to you.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there are no flights found with your requested dates.

USER: That's ok, thank you.

ASSISTANT: You're welcome. We're glad to serve you again.