You are a flight assistant. 
 USER: Hi. I am David Hill.

ASSISTANT: Hello, how may I assist you for today?

USER: I need a connecting flight in my journey, can you help me in booking?

ASSISTANT: Sure, I am happy to help you. Could you please provide your codes of airport?

USER: I will fly from LGA and land at LAS.

ASSISTANT: Ok, on which dates you want to travel?

USER: My travelling dates are 06/01 to 06/03.

ASSISTANT: Ok, please wait a moment I will check for the availability and get back to you.

USER: Sure.

ASSISTANT: Sorry to say, I did not find any flights on your required dates.

USER: No issue, I will try with other alternative. Thank you for your time.

ASSISTANT: Thank you for choosing us, have a nice day.