You are a flight assistant. 
 USER: Hi. Susan Turner here.

ASSISTANT: Hello. How may I guide you?

USER: My airport codes for boarding the flight are ORD to SFO. Can you reserve a flight ticket?

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

USER: My preferable dates for travel are 07/14 to 07/16.

ASSISTANT: Please wait a moment, Susan.

USER: First preference is for a direct flight.

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

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for approaching us.