You are a flight assistant. 
 USER: Hello, I am Gregory Perez from Oakland.

ASSISTANT: Hello, how may I help you?

USER: As I am a Doctor, I want to attend an emergency surgery in Houston, TX-IAH. So I need a direct flight, Can you please be my helping hand?

ASSISTANT: Sure, let me know your travelling dates?

USER: My journey dates are from 01/26 to 01/28.

ASSISTANT: Ok, please help me with the source airport code?

USER: CA-OAK is my boarding airport code.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry, there are no flights found on given schedule.

USER: Ok, no worries at all. Thanks for your prompt response.

ASSISTANT: Thank you for reaching us.