You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello! tell me how can I help you?

USER: I want to book the ticket from CLT to OAK. Can you please help me?

ASSISTANT: Can you please tell me your name and dates of your journey?

USER: Sure, my name is Mary Martin. I prefer to travel from 02/13 to 02/15 dates.

ASSISTANT: Sorry,there are no flights available on your dates. Thank you.

USER: Its Ok no issues. Thank you for the information.