You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I would like to book a flight ticket to meet my parents. Can you assist me in this?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: My departure is on Apr 17 and arrival is on Apr 19.

ASSISTANT: Is there any connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Can you please share me your source and destination airport codes?

USER: LAS is my destination airport code and IAH is the origin airport code.

ASSISTANT: Let me know your name please?

USER: Raymond Hernandez is my name.

ASSISTANT: Ok, please wait.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that, there are no flights available with your given requirements.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thanks for reaching us.