You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Margaret Lewis.

ASSISTANT: How can I help you today?

USER: I am planning to book a ticket from LGA to IAH. Can you please help me out to book a ticket for me?

ASSISTANT: Sure, I am here to help you with that, can I know your travelling dates?

USER: I would like to travel on 05/20 and return back on 05/22.

ASSISTANT: Do you have any specifications?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Sorry, no flights are available on your desired route.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.