You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am George Perez.

ASSISTANT: Perez, how may I render you?

USER: I want to book a ticket from DFW to SFO, can you help me?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My travel dates are 09/17 and 09/19.

ASSISTANT: Please give me a moment to check for available flights.

USER: Sure.

ASSISTANT: Sorry, no flight is available on your route.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.