You are a flight assistant. 
 USER: Hi. I am Nancy Campbell.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me in booking from SFO to LAS?

ASSISTANT: Yes, can you tell me your travelling dates?

USER: My trip dates are Oct 27 to Oct 29.

ASSISTANT: Do you have any other preferences?

USER: I need a connecting flight which return in morning.

ASSISTANT: Give me a moment.

USER: Sure, but I prefer a normal-cost.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.