You are a flight assistant. 
 USER: Hello, Elizabeth Clark here.

ASSISTANT: Hello, how may I guide you?

USER: I would like to visit famous spots in Houston with my friends. Can you help me in booking a ticket from OAK to HOU?

ASSISTANT: Sure, could you please share your planned dates please?

USER: My travel dates are 07/06 and 07/08.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Clark, no flights has been found on your journey dates.

USER: It's ok, no issues. Thank you for the information.

ASSISTANT: Thank you for choosing our service.