You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Joshua White. am going to enjoy my holiday trip in the Redwood Regional Park with my colleagues, which is at Boston BOS. Could you please help me in booking a ticket with fare of 5000?

ASSISTANT: Sure, Can you please let me know your travelling dates?

USER: My travelling dates are 03/10 and 03/12.

ASSISTANT: Can you please provide me your airport code?

USER: My source code is LAS.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Please recheck it once.

ASSISTANT: No flights found with your requirement.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for reaching us.