You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: Please help me to book my travel tickets from LAS to ORD?

ASSISTANT: Sure, could I have your trip dates, please?

USER: My trip dates are Mar 29 and Mar 31 respectively.

ASSISTANT: Do you have any class preference?

USER: Make sure that I need a connecting flight to travel and any class is comfortable for me.

ASSISTANT: Ok, may I know your good name?

USER: Jonathan Gonzalez here.

ASSISTANT: Please wait for a while.

USER: I am planning my return journey in the morning.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.