You are a flight assistant. 
 USER: Hi, I am Janet Perez from Houston.

ASSISTANT: Hello. How may I help you today?

USER: I am planning to book a flight on Apr 27 to reach Charlotte, so please help me in booking a flight with a halt.

ASSISTANT: Sure, may I know your travelling airport codes?

USER: My airport codes are HOU - CLT.

ASSISTANT: Please mention your return travel date?

USER: I intend to return on Apr 29th.

ASSISTANT: Please hold a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flight tickets available on your journey dates,.

USER: No worries, thank you.

ASSISTANT: Thank you for reaching our service.