You are a flight assistant. 
 USER: Hello, I am Donald Green.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to meet my brother on his birthday.So, can you please book a flight ticket to Minneapolis & St.paul, MSP?

ASSISTANT: Sure, do you have any price limit?

USER: Yes, I can afford up to 1000.

ASSISTANT: When did you planned to travel?

USER: I am planning to travel on 08/22 to 08/24.

ASSISTANT: Help me with the source code?

USER: New York, LGA.

ASSISTANT: Sorry, we found no flights to your destination.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for reaching us.