You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: I am Karen Davis. I need to book a ticket from MSP to LGA to meet attend the conference meeting. Could you please help me in doing that?

ASSISTANT: Sure, may I know when would you like to travel?

USER: My travelling dates are 12/26 and return on 12/28.

ASSISTANT: Ok, how much fare are you expecting?

USER: I can bare up to 500.

ASSISTANT: Thanks for sharing your essentials. There are no flights available at this moment as you requested.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.