You are a flight assistant. 
 USER: Hello, Brenda Davis here.

ASSISTANT: Hello Davis, how may I help you?

USER: Can you book my tickets from IAH to HOU?

ASSISTANT: Sure, will you please provide me your travelling dates?

USER: From 07/01 to 07/03.

ASSISTANT: Sorry for inconvenience there is no flight matching your criteria.

USER: It's ok. Thank you for your information.

ASSISTANT: You are welcome.