You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Please help me to book a flight ticket from IAH to LGA.

ASSISTANT: May I know on which dates you are willing to travel?

USER: My journey dates are from Feb, 20 to Feb,22.

ASSISTANT: Do you require any stopovers in your journey?

USER: I need a single connecting flight.

ASSISTANT: Do you have any other requirements?

USER: I prefer to return in the evening.

ASSISTANT: May I know your name?

USER: Ashley Miller.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: Thank you for your information.

ASSISTANT: Thank you.