You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I aid you?

USER: Can you help me to book a flight from IAD to LAX?

ASSISTANT: Sure, May I know your travelling dates?

USER: My travelling dates are Mar 16 and 18.

ASSISTANT: Do you have any connection limit?

USER: I prefer to travel in a connecting flight.

ASSISTANT: May I know your name?

USER: My name is Mary Martinez.

ASSISTANT: Are there any other preferences?

USER: I want to return at afternoon time.

ASSISTANT: Sorry, there are no flights found with your details.

USER: No issues, thank you for your time.

ASSISTANT: Thank you.