You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: My name is Alexander Taylor. I need a flight ticket under the range of 500. Can you help me with book my flight ticket with connecting flight?

ASSISTANT: Could you provide me your travel dates?

USER: My travelling dates are from 03/01 to 03/03.

ASSISTANT: Kindly mention me your airport codes?

USER: My boarding point is IAD. And landing point is OAK.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform no flight found with your requirement.

USER: Ok, No problem. Thank you.

ASSISTANT: Thanks for reaching us, have a good day.