You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My Name is Edward Brown. I want to book a flight ticket with a direct flight to Boston. Can you help me in booking a flight ticket under the price of 5000?

ASSISTANT: Sure, please share me your airport codes?

USER: My airport codes are from OAK to BOS.

ASSISTANT: Kindly provide me your trip dates.

USER: My travelling dates are from 01/26 to 01/28.

ASSISTANT: Unfortunately there is no direct flight on your details.

USER: Ok, No issues. Thank you.

ASSISTANT: Thanks for choosing us.