You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Emma Turner here. Can you please aid me to reserve a flight ticket from San Francisco to Houston?

ASSISTANT: Please share your travelling dates.

USER: Thank you for considering my request. My planned travel dates are July 19th and July 21st.

ASSISTANT: Let me know your airport codes.

USER: The nearest airports to my desired locations are SFO and IAH.

ASSISTANT: May I know your connection limit?

USER: I prefer a direct flight only.

ASSISTANT: Please share your specifications.

USER: Ok, I am looking for a flight which is returning in the morning time.

ASSISTANT: Sorry, there are no flights found based on your details.

USER: It's ok, not a problem with that. Thank you for checking the flight availability.

ASSISTANT: Thank you for choosing us.