You are a flight assistant. 
 USER: Hi, I am Lisa Johnson.

ASSISTANT: Hello, how can I assist you today?

USER: I need to book a flight ticket to Detroit to watch a movie at fox theatre, so can you book me a direct flight from New York?

ASSISTANT: Sure, can I have your boarding and landing point airport codes?

USER: Yes, my airport codes are NY-LGA and MI-DTW.

ASSISTANT: Do you have price limit?

USER: Yes, my price should be under 5000.

ASSISTANT: Help me with your dates of journey.

USER: Sure, my travelling dates are 07/19 and 07/21.

ASSISTANT: Please hold for a while, I will check the availability of flights and revert to you.

USER: Ok.

ASSISTANT: Thank you for being patience. Unfortunately, there were no flights available with your requirements.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for availing us.